W.J. Roberts, D.R. Mears, M.F. James
The flooded floor system developed for solar heating of greenhouses has provided a convenient system for warming the soil for many greenhouse crops. An alternative system utilizing plastic pipes on 0.3 meter spacing covered with 7 cm of porous concrete has been developed and is being utilized commercially. This system transfers heat to the greenhouse aerial environment at about two-thirds the rate of the flooded floor system. When potted plants are set on the floor, there is a significant contribution to the greenhouse heat requirement. Warm water can be provided by fossil-fuel-fired boilers, solar collectors or waste heat sources. Research results on varied pipe spacings are presented and the performance of commercial installations is discussed.
Roberts, W.J., Mears, D.R. and James, M.F. (1981). FLOOR HEATING OF GREENHOUSES. Acta Hortic. 115, 259-268
DOI: 10.17660/ActaHortic.1981.115.28

Acta Horticulturae